Optical waveguides – Optical fiber waveguide with cladding
Patent
1995-05-22
1996-03-26
Ullah, Akm E.
Optical waveguides
Optical fiber waveguide with cladding
372 48, G02B 602, G02B 616
Patent
active
055027873
ABSTRACT:
Articles according to the invention include a semiconductor waveguide having a core and a cladding, with the cladding including doped semiconductor material. The doping level is selected such that both the real part n and the imaginary part k of the complex refractive index of the doped material are relatively low, exemplarily n<0.5 .epsilon..sub..infin..sup.1/2 and k<1, where .epsilon..sub..infin. is the high frequency lattice dielectric constant of the material. Appropriate choice of the doping level can result in improved confinement of the guided radiation without undue increase in the attenuation of the guided radiation. The invention exemplarily is embodied in a long wavelength (.about.8.5 .mu.m) quantum cascade laser. Other embodiments are contemplated.
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"Vertical Transition Quantum Cascade Laser with Bragg Confined Excited State", by J. Faist et al., Applied Physics Letters, vol. 66(5), 30 Jan. 1995, pp. 538-540.
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"Mid-Infrared Phase Modulation via Stark Effect on Intersubband Transitions in GaAs/GaAlAs Quantum Wells", by E. B. Dupont et al., IEEE Journal of Quantum Electronics, vol. 29, No. 8, Aug. 1993, pp. 2313-2318.
Capasso Federico
Cho Alfred Y.
Faist Jerome
Hutchinson Albert L.
Sirtori Carlo
AT&T Corp.
Pacher Eugen E.
Ullah Akm E.
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